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Method and device for determining internal resistance of power battery

A power battery and a technology for determining methods, which are applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as large errors in test data results, and achieve the effects of facilitating accurate estimation, maintaining healthy operation, and avoiding complicated measurement operations

Active Publication Date: 2021-05-25
SHENZHEN KELIE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large change in the ambient temperature of the actual vehicle, the internal resistance of the power battery fluctuates with the temperature change, so the test data results have a large error

Method used

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  • Method and device for determining internal resistance of power battery
  • Method and device for determining internal resistance of power battery
  • Method and device for determining internal resistance of power battery

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Embodiment Construction

[0058] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0059] refer to figure 1 , shows a flowchart of the steps of an embodiment of a method for determining the internal resistance of a power battery according to the present invention.

[0060]Embodiments of the present invention may specifically include the following methods:

[0061] Step 101, obtaining the historical data records of the power ba...

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Abstract

The present invention provides a method and device for determining the internal resistance of a power battery. The method includes: acquiring historical data records of the power battery of an electric vehicle; The theoretical internal resistance value; determining the internal resistance correction parameter; using the internal resistance correction parameter to correct the theoretical internal resistance value to obtain the actual internal resistance value of the power battery within a specified time period. The present invention calculates the theoretical internal resistance value according to the historical data records, and corrects the theoretical internal resistance value through the internal resistance correction parameter to obtain the actual internal resistance value, and does not need to measure the internal resistance of the battery by adding a direct current with a change in size, thus avoiding the complicated measurement operation of the method At the same time, the influence of temperature on the internal resistance of the battery is eliminated through the internal resistance correction parameter, and the actual internal resistance obtained is highly accurate, which facilitates accurate estimation of the available capacity of the battery and maintains the healthy operation of the electric vehicle power battery.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a method and device for determining the internal resistance of a power battery. Background technique [0002] The early battery management systems of electric vehicles did not pay much attention to the storage of battery history information. With the deepening of research in this field, the storage and analysis of historical information has gradually gained attention. [0003] In the development stage of electric vehicles, mastering the historical information of power batteries is of great significance for the debugging of electric vehicles. Through the analysis of historical data, it is possible to grasp the changes in voltage and temperature during the working process of the battery, and to analyze whether there are potential safety hazards; to calculate the energy consumption of the battery in order to analyze the mileage of the car; at the same time, it is also possible to a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/389G01R31/367
Inventor 聂佳孙艳鲍剑明
Owner SHENZHEN KELIE TECH
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